At least there is a feature called 'discussions' coming soon to github. That should hopefully minimize the abuse of issues. But that is also due to the fact of current github. Not everyone is displaying their email and there is no other communication channel.

I think a lot of it is maybe bleed over from gaming communities, especially emulators, maybe rom hacks too? I’ve noticed barrages of useless bug reports on those repositories. But I’ve been surprised to find them on far afield stuff as well.